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Department of Computer Science; University of California at Davis; One Shields Ave.

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Davis, CA 95616-8562

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ABSTRACT

This note presents a new model for classifying vulnerabilities in computer systems. The model is structurally different than earlier models, It decomposes vulnerabilities into small parts, called "primitive conditions. " Our hypothesis is that by examining systems for these conditions, we can detect vulnerabilities. By preventing these conditions from holding, we can prevent vulnerabilities from occurring, even if we do not know that the vulnerability exists. A formal basis for this model is presented. An informal, experimental method of validation for non- secure systems is described. If the model accurately describes existing systems, it guides the development of tools to analyze systems for vulnerabilities. 1.